NEET BIOLOGY BY SHASHI SIR

Pedigree analysis one should remember three points to define pedigree analysis it is the the study of a persons' family genetic history or family tree it is made up of symbols and lines  and used to trace Mendelian disorders in a family  let us understand the above statement of pedigree analysis. one, as compare to the other animal and plants human has a very long life span. it is nearly impossible to make controlled breeding experiments on humans as Mendel had performed on pea plant ( pisum sativum ). Therefore pedigree analysis becomes most advantageous to learn the pattern of inheritance of a trait or character in a family. it helps us to trace and find the probability of occurrence of Mendelian disorder as these disorders follow Mendelian pattern of inheritance.  symbols and lines Pedigree can be performed for all the Mendelian disorder such as- 1- autosomal or autosome linked recessive 2- autosomal or autosome linked dominant 3- sex-linked (X-linked) reces